Create SECURITY.md

Author: tommoor

SECURITY.md

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+# Security Policy
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+## Reporting a Vulnerability
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+The Outline team takes security bugs seriously. We appreciate your efforts to responsibly disclose your findings, and will make every effort to acknowledge your contributions.
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+To report a security issue, email [[email protected]](mailto:[email protected]) and include the word "SECURITY" in the subject line.
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+The Outline team will send a response indicating the next steps in handling your report. After the initial reply to your report you will be kept informed of the progress towards a fix and full announcement.
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+Report security bugs in third-party dependencies to the person or team maintaining the module. You can also report a vulnerability through the [Node Security Project](https://nodesecurity.io/report).